/* CSS Custom Properties - Enhanced Design System */
:root {
  /* ===== COLOR PALETTE ===== */
  /* Brand Colors */
  --color-primary: #1a1a1a;
  --color-primary-light: #4a4a4a;
  --color-primary-dark: #000000;
  --color-primary-accent: #2563eb;
  
  --color-secondary: #10b981;
  --color-secondary-light: #34d399;
  --color-secondary-dark: #059669;
  
  /* Semantic Colors */
  --color-success: #22c55e;
  --color-success-light: #86efac;
  --color-success-dark: #16a34a;
  
  --color-danger: #ef4444;
  --color-danger-light: #fca5a5;
  --color-danger-dark: #dc2626;
  
  --color-warning: #f59e0b;
  --color-warning-light: #fcd34d;
  --color-warning-dark: #d97706;
  
  --color-info: #3b82f6;
  --color-info-light: #93c5fd;
  --color-info-dark: #2563eb;
  
  /* Neutral Colors - Extended */
  --color-white: #ffffff;
  --color-gray-25: #fafafa;
  --color-gray-50: #f5f5f5;
  --color-gray-100: #e5e5e5;
  --color-gray-200: #d4d4d4;
  --color-gray-300: #a3a3a3;
  --color-gray-400: #737373;
  --color-gray-500: #525252;
  --color-gray-600: #404040;
  --color-gray-700: #262626;
  --color-gray-800: #171717;
  --color-gray-900: #0a0a0a;
  
  /* Gradient Colors */
  --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  --gradient-success: linear-gradient(135deg, var(--color-success) 0%, var(--color-success-dark) 100%);
  --gradient-danger: linear-gradient(135deg, var(--color-danger) 0%, var(--color-danger-dark) 100%);
  
  /* ===== TYPOGRAPHY ===== */
  /* Font Families */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  --font-family-heading: var(--font-family-base);
  
  /* Font Sizes - Extended */
  --font-size-xs: 0.75rem;     /* 12px */
  --font-size-sm: 0.875rem;    /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-lg: 1.125rem;    /* 18px */
  --font-size-xl: 1.25rem;     /* 20px */
  --font-size-2xl: 1.5rem;     /* 24px */
  --font-size-3xl: 1.875rem;   /* 30px */
  --font-size-4xl: 2.25rem;    /* 36px */
  --font-size-5xl: 3rem;       /* 48px */
  --font-size-6xl: 3.75rem;    /* 60px */
  
  /* Font Weights */
  --font-weight-thin: 100;
  --font-weight-extralight: 200;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --font-weight-black: 900;
  
  /* Line Heights */
  --line-height-none: 1;
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;
  
  /* Letter Spacing */
  --letter-spacing-tighter: -0.025em;
  --letter-spacing-tight: -0.0125em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.0125em;
  --letter-spacing-wider: 0.025em;
  --letter-spacing-widest: 0.05em;
  
  /* ===== SPACING ===== */
  /* 8px Grid System - Extended */
  --spacing-px: 1px;
  --spacing-0: 0;
  --spacing-0_5: 0.125rem;   /* 2px */
  --spacing-1: 0.25rem;      /* 4px */
  --spacing-1_5: 0.375rem;   /* 6px */
  --spacing-2: 0.5rem;       /* 8px */
  --spacing-2_5: 0.625rem;    /* 10px */
  --spacing-3: 0.75rem;       /* 12px */
  --spacing-3_5: 0.875rem;    /* 14px */
  --spacing-4: 1rem;         /* 16px */
  --spacing-5: 1.25rem;      /* 20px */
  --spacing-6: 1.5rem;       /* 24px */
  --spacing-7: 1.75rem;      /* 28px */
  --spacing-8: 2rem;          /* 32px */
  --spacing-9: 2.25rem;       /* 36px */
  --spacing-10: 2.5rem;       /* 40px */
  --spacing-11: 2.75rem;      /* 44px */
  --spacing-12: 3rem;         /* 48px */
  --spacing-14: 3.5rem;       /* 56px */
  --spacing-16: 4rem;         /* 64px */
  --spacing-20: 5rem;         /* 80px */
  --spacing-24: 6rem;         /* 96px */
  --spacing-28: 7rem;         /* 112px */
  --spacing-32: 8rem;         /* 128px */
  
  /* ===== BORDERS ===== */
  /* Border Radius - Extended */
  --radius-none: 0;
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-2xl: 16px;
  --radius-3xl: 24px;
  --radius-full: 9999px;
  
  /* Border Width */
  --border-width-0: 0;
  --border-width-1: 1px;
  --border-width-2: 2px;
  --border-width-4: 4px;
  --border-width-8: 8px;
  
  /* Border Colors */
  --border-color-default: var(--color-gray-200);
  --border-color-focus: var(--color-primary-accent);
  --border-color-error: var(--color-danger);
  --border-color-success: var(--color-success);
  
  /* ===== SHADOWS ===== */
  /* Shadow Colors */
  --shadow-color: rgba(0, 0, 0, 0.1);
  --shadow-color-dark: rgba(0, 0, 0, 0.2);
  
  /* Shadow Sizes - Extended */
  --shadow-none: 0 0 #0000;
  --shadow-sm: 0 1px 2px 0 var(--shadow-color);
  --shadow-md: 0 4px 6px -1px var(--shadow-color), 0 2px 4px -1px var(--shadow-color);
  --shadow-lg: 0 10px 15px -3px var(--shadow-color), 0 4px 6px -2px var(--shadow-color);
  --shadow-xl: 0 20px 25px -5px var(--shadow-color), 0 10px 10px -5px var(--shadow-color);
  --shadow-2xl: 0 25px 50px -12px var(--shadow-color-dark);
  --shadow-inner: inset 0 2px 4px 0 var(--shadow-color);
  
  /* Colored Shadows */
  --shadow-primary: 0 4px 14px 0 rgba(26, 26, 26, 0.15);
  --shadow-success: 0 4px 14px 0 rgba(34, 197, 94, 0.15);
  --shadow-danger: 0 4px 14px 0 rgba(239, 68, 68, 0.15);
  --shadow-warning: 0 4px 14px 0 rgba(245, 158, 11, 0.15);
  --shadow-info: 0 4px 14px 0 rgba(59, 130, 246, 0.15);
  
  /* ===== TRANSITIONS ===== */
  /* Transition Durations */
  --transition-duration-75: 75ms;
  --transition-duration-100: 100ms;
  --transition-duration-150: 150ms;
  --transition-duration-200: 200ms;
  --transition-duration-300: 300ms;
  --transition-duration-500: 500ms;
  --transition-duration-700: 700ms;
  --transition-duration-1000: 1000ms;
  
  /* Transition Timing Functions */
  --transition-ease-linear: linear;
  --transition-ease-in: cubic-bezier(0.4, 0, 1, 1);
  --transition-ease-out: cubic-bezier(0, 0, 0.2, 1);
  --transition-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Transition Properties */
  --transition-property-none: none;
  --transition-property-all: all;
  --transition-property-common: background-color, border-color, color, fill, stroke, opacity, box-shadow, transform;
  --transition-property-colors: background-color, border-color, color, fill, stroke;
  --transition-property-opacity: opacity;
  --transition-property-shadow: box-shadow;
  --transition-property-transform: transform;
  
  /* Combined Transitions */
  --transition-fast: var(--transition-duration-150) var(--transition-ease-out);
  --transition-normal: var(--transition-duration-300) var(--transition-ease-out);
  --transition-slow: var(--transition-duration-500) var(--transition-ease-out);
  --transition-colors: var(--transition-duration-150) var(--transition-ease-in-out);
  --transition-transform: var(--transition-duration-300) var(--transition-ease-out);
  
  /* ===== Z-INDEX ===== */
  --z-auto: auto;
  --z-0: 0;
  --z-10: 10;
  --z-20: 20;
  --z-30: 30;
  --z-40: 40;
  --z-50: 50;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
  --z-max: 2147483647;
  
  /* ===== LAYOUT ===== */
  /* Container Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
  --container-full: 100%;
  
  /* Max Widths */
  --max-w-none: none;
  --max-w-xs: 20rem;
  --max-w-sm: 24rem;
  --max-w-md: 28rem;
  --max-w-lg: 32rem;
  --max-w-xl: 36rem;
  --max-w-2xl: 42rem;
  --max-w-3xl: 48rem;
  --max-w-4xl: 56rem;
  --max-w-5xl: 64rem;
  --max-w-6xl: 72rem;
  --max-w-7xl: 80rem;
  --max-w-full: 100%;
  --max-w-screen-sm: 640px;
  --max-w-screen-md: 768px;
  --max-w-screen-lg: 1024px;
  --max-w-screen-xl: 1280px;
  --max-w-screen-2xl: 1536px;
  
  /* Breakpoints */
  --breakpoint-xs: 0;
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
  
  /* ===== COMPONENTS ===== */
  /* Navigation */
  --navbar-height: 4rem;
  --navbar-height-mobile: 3.5rem;
  --navbar-padding-x: var(--spacing-4);
  --navbar-padding-y: var(--spacing-2);
  
  /* Toggle Switch */
  --toggle-width: 3rem;
  --toggle-height: 1.5rem;
  --toggle-slider-size: 1.25rem;
  --toggle-border-width: var(--border-width-2);
  --toggle-transition: var(--transition-transform);
  
  /* Buttons */
  --button-padding-x: var(--spacing-6);
  --button-padding-y: var(--spacing-3);
  --button-font-size: var(--font-size-base);
  --button-font-weight: var(--font-weight-medium);
  --button-border-radius: var(--radius-md);
  --button-shadow: var(--shadow-sm);
  --button-shadow-hover: var(--shadow-md);
  
  /* Forms */
  --form-padding-x: var(--spacing-3);
  --form-padding-y: var(--spacing-3);
  --form-border-width: var(--border-width-2);
  --form-border-radius: var(--radius-md);
  --form-font-size: var(--font-size-base);
  --form-focus-ring: 0 0 0 3px rgba(37, 99, 235, 0.1);
  
  /* Cards */
  --card-padding: var(--spacing-6);
  --card-border-radius: var(--radius-xl);
  --card-shadow: var(--shadow-md);
  --card-shadow-hover: var(--shadow-lg);
  
  /* Tables */
  --table-padding: var(--spacing-4);
  --table-border-color: var(--color-gray-200);
  --table-header-bg: var(--color-gray-50);
  --table-hover-bg: var(--color-gray-50);
  --table-striped-bg: var(--color-gray-25);
  
  /* Modals */
  --modal-padding: var(--spacing-8);
  --modal-border-radius: var(--radius-2xl);
  --modal-shadow: var(--shadow-2xl);
  --modal-backdrop: rgba(0, 0, 0, 0.5);
  
  /* Toasts */
  --toast-padding: var(--spacing-3) var(--spacing-6);
  --toast-border-radius: var(--radius-md);
  --toast-shadow: var(--shadow-lg);
  --toast-margin: var(--spacing-4);
  
  /* ===== ANIMATIONS ===== */
  /* Animation Durations */
  --animation-duration-fast: 150ms;
  --animation-duration-normal: 300ms;
  --animation-duration-slow: 500ms;
  
  /* Animation Easing */
  --animation-ease-in: cubic-bezier(0.4, 0, 1, 1);
  --animation-ease-out: cubic-bezier(0, 0, 0.2, 1);
  --animation-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Keyframes */
  --animation-spin: spin 1s linear infinite;
  --animation-ping: ping 1s cubic-bezier(0, 0, 0.2, 1) infinite;
  --animation-pulse: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
  --animation-bounce: bounce 1s infinite;
  
  /* ===== ACCESSIBILITY ===== */
  /* Focus Ring */
  --focus-ring-width: 2px;
  --focus-ring-color: var(--color-primary-accent);
  --focus-ring-offset: 2px;
  --focus-ring: var(--focus-ring-width) solid var(--focus-ring-color);
  --focus-ring-offset-outline: var(--focus-ring) offset var(--focus-ring-offset);
  
  /* High Contrast Mode */
  --high-contrast-border: 2px solid currentColor;
  
  /* Reduced Motion */
  --reduced-motion-duration: 0.01ms;
  
  /* ===== INTERACTIVE STATES ===== */
  /* Hover */
  --hover-bg-light: rgba(0, 0, 0, 0.05);
  --hover-bg-dark: rgba(255, 255, 255, 0.1);
  
  /* Active */
  --active-scale: 0.98;
  --active-bg-light: rgba(0, 0, 0, 0.1);
  --active-bg-dark: rgba(255, 255, 255, 0.2);
  
  /* Disabled */
  --disabled-opacity: 0.6;
  --disabled-cursor: not-allowed;
  
  /* ===== GRADIENTS ===== */
  /* Background Gradients */
  --gradient-hero: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  --gradient-subtle: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-gray-100) 100%);
  --gradient-accent: linear-gradient(135deg, var(--color-primary-accent) 0%, var(--color-info) 100%);
  
  /* Text Gradients */
  --gradient-text-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  --gradient-text-accent: linear-gradient(135deg, var(--color-primary-accent) 0%, var(--color-info) 100%);
}